System for producing oscillations



June 30, 1925. 1,544,202

W. C. WHITE SYSTEM FOR PRODUCING OSGILLATIONS Filed Jan. Q, 1921 lam/e111: or William (RX/H136,

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Patented June 30, 1 925.

"UNITEQ STATES PATENT OFFICE.

WILLIAM C. WHITE, 01 SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC i COMPANY, A CORPORATION OF NEW YORK. v I I SYSTEM FOR PRODUCING OSOILLATIONS.

Application filed January 20, 1921. Serial No. 438,560.

To all whom it may concern.

Be it known that I, WILLIAM C. WHITE, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have mvented certain new and useful Improvements in Systems for Producing Oscillations, of which the following is a specification.

My present invention relates to the production of electrical oscillations, and more particularly to the production of such oscillations in a radio transmitting system.

The first object of my invention is to provide a simple and efficient system for producing high frequency oscil ations which will be particularly adapted for operation over a wide range of frequencies and which will require a minimum number of adjustments for securing the most efficient operation over the same range of frequencies.

In many of the oscillating systems employing electron discharge devices for producing and transmitting by radio high frequency oscillations, which have previously been employed, it has been customary to em ploy the transmitting antenna as the oscillating circuit and to derive the energy necessary for exciting the grid to maintain oscillations directly or indirectly from the antenna system. In the operation of such systems three adjustments have been necessary to obtain good efliciency in operation, namely (1) Adjustment of antenna inductance for desired wave length;

(2) Adjustment of the ratio of transformation between the antenna and the electron discharge device;

(3) Adjustment of grid coil and of cow pling between antenna and grid circuit to vary the phase and voltage of the energy supplied to the grid to maintain oscillations.

Because of the fact that these adjustments are more or less dependent upon one another a more or less cut and try process is necessary in order to secure the desired output and operating efficiency. For example, the third adjustment depends upon the first two because of the fact that the grid excitation is dependent upon antenna current and any adjustment which changes the antenna current will necessitate a change in the third adjustment to secure the best results.

A second object of my invention is to pro-- vide a system in which the third adjustment mentioned will be unnecessary over a wide range of frequencies.

In attaining the objects of my invention I provide a coupling to the grid circuit from the portion of the plate circuit which supplies energy to the oscillating system. When the system is operating at rated output, the current voltage relations in this portion of the plate circuit are the same regardless of the'frequen'cy generated or the constants of the antenna as these conditions are fixed by the second adjustment. No re ad ustment of the coupling to the grid circuit with change in antenna constants is phase relation and voltage of the energy supplied to the grid circuit, once it has been adjusted to one antenna system.

The novel features which I believe to be characteristic of my invention are set forth with particularity inthe appended claims; the myention itself, however, both as to its organization andmethod of operation will best be understood by reference to the following description takenin connection with the accompanying drawing in which I have illustrated diagrammatically one way in which my invention may be carried into effect.

I have indicated in the drawing an electron discharge device having the usual filamentary cathode 2 anode 3, and grid 4. The anode 3 is connected to an inductance 5, a portion of which is in circuit with the antenna 6, variable connections 7 and 8 benecessary therefore to obtain the desired ing provided for varying the coupling betion 8 and the couplin I stant.

circuit between cathode and anode. This circuit contains inductance .L- which is closely coupled to inductance 12 in 1511601?- cuit between cathode and grid. This grid circuit may also include the usual grid condenser 13 and the grid leak 14. A stopping condenser 15 is inserted in the connection between anode and antenna in order to prevent short-circuiting of the source 10.

In the operation of the systemv the tuning of the antenna ma 1 be accomplished in any desired. way as y varying'the connecand the antenna may adjusted by varying the connection 7. p A system of this sort will ordinarily be operated at a certain rated output and by making the two adjustments described this rated output may be obtained the plate and when the plate to antenna,

ratio is correctly made will therefore remain substantially constant over a wide range of wave lengths and the phase of the energy thus sup lied will also be substantially cona 'result no change in the coupling between the plate circu1t and the grid circuit. will be required in order to secure the desired results.

While I have illustrated and described only one embodiment of my invention it will be obvious that my invention is by no means limited to the particular embodiment indicated, but that many modifications in the circuit connections employed may be made without departing from the scope of my in.-

vention as set forth in the appended claims. While I claim as'new and desire to secure by Letters Patent of the United States,

1. The combination in a system for producing electrical oscillations of an electron discharge device having a cathode, an anode and a grid, an oscillating circuit coupled to a shunt circuit between cathode and anode, a second circuit connected between cathode and anodefcontaining a source of ener a circuit between cathode and grid an a couplingbetween the second circuit between cathode and anode and the circuit between cathode and grid, the frequency of the oscillations produced being determined'principally by the constants of said oscillating circuit.

2. The combination in a system for producing electrical oscillations of an electron discharge device having a cathode, an anode and a grid, an oscillating circuit coupled between the device duced being. determined and anode containing a source of energy and to a shunt circuit between cathode and anode, a second circuit connected between cathode and anode containing a source of energy and an inductance, a circuit between cathode and grid and a coupling between 7 the inductance in the second circult between cathode and anode and the circuit between cathode and grid, the frequency of the oscillations produced being determined principally by the constants of said oscillatingcircuit.

3. The combination in a system for producing electrical oscillations of an electron discharge devicehaving a cathode an anode and a grid, an oscillating circuit coupled to a shunt circuit between cathode and anode, a second circuit connected between cathode and anode containing a source of energy and an inductance and a circuit between cathode and grid containing. an inductance which is coupled to the inductance" in the second circuit between cathode and' anode, the frequency of the oscillations proprincipally by the Y constants of said oscillating circuit.

4. The combination in a system for producing electrical oscillations of an electron discharge device having a' cathode, an anode and a grid, an oscillating antenna associated .with a shunt circuit between the cathode and anode, a separate circuit between' cathode and anode containing a source of energy, a grid circuit and 'means for supplying to the grid circuit from the separate circuit between cathode and anode energy for maintaining oscillations in the system, the energy thus supplied being independent of the constants of the antenna and the frequency of the currents generated and the frequency of the currents generated being determined principally by the constants of the antenna. a

5. The combination in a system for producing electrical oscillations of an electron dischar e device having a cathode, an anode, n and grid, an oscillating antenna associated with a shunt circuit between the cathode and an anode, a separate circuit between cathode an inductance, a grid circuit and means for suplying to the grid circuit from the inductance in the separate circuit between cathode and anode energy for maintaining oscillations in the system the frequency of which are determined principally by the antenna constants, the energy thus supplied being independent of the constants of the antenna and the frequency of the currents generated.

6. The combination in a system for producing electrical oscillations of an electron discharge device having a cathode, an anode and a grid, an oscillating antenna associated with the cathode and anode, a separate circuit between cathode and anode containing a source of energy, a grid circuit, said cirenergy thus supplied being independent of cuits being closely coupled in order to supthe constants of the antenna and the freply to the grid circuit from the separate quency of the currents generated. 10 circuit between cathode and anode energy In Witness whereof, I have hereunto set 6 for maintaining oscillations in the system my hand this 18th day of January 1921. the frequency of which are determined principally by the antenna constants, the WILLIAM 0. WHITE. 

